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MCSE: Windows 2000 Exams in a Nutshell by Paul Murphy, Michael Moncur

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NetBIOS Name Resolution

The NetBIOS API provides support for the naming scheme used by Windows networking: computer names, domains, and workgroups. Windows 2000 includes NetBIOS over TCP/IP (NBT), a service that allows NetBIOS communications and name resolution through TCP/IP.

After the HOSTS file and DNS fail to locate an IP hostname, Windows 2000 clients can use NetBIOS resolution. NetBIOS names have their own rules for domain resolution and their own name server service (WINS).

The steps involved in NetBIOS name resolution depend on the client’s NetBIOS node type or name resolution mode. The following are the five possible node types and their name resolution methods:

B-node (broadcast)

These nodes send a broadcast (NetBIOS name query) to the entire local subnet when they need to resolve a name. The broadcast is repeated three times, if necessary. Each machine on the subnet compares the NetBIOS name in the broadcast with its own name. If a machine finds a match, it sends a reply (NetBIOS name query response) to the original node, and the NetBIOS session is established.

Enhanced B-node

This is Microsoft’s nonstandard version of the B-node method and is Windows NT’s default if a WINS server is not used. The broadcasts are sent as in the previous ...

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